JINGLING 165mm 6-9/16" inch Diamond Coated Drill Bit Hole Cutter Saw for Glass Tile Ceramic Marble Color Silver Product Name: 165mm Diamond tip drill bit, 165 mm Glass hole saw bit, 6-9/16 inch Glass drill bit Hole Diameter:165mm (6-9/16" inch); Shank Diameter:11mm; Total Length:60mm; Drilling Depth:29mm Suitable for use in drill hole on glass, tile, ceramic, stone, marble or granite The hole does not need further work because the cut is clean Start drill at 45 degree to surface and align to 90 degree as hole forms